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#ifndef RUST_TASK_THREAD_H
#define RUST_TASK_THREAD_H
#include "rust_internal.h"
#include "sync/rust_thread.h"
#include "rust_stack.h"
#include "context.h"
#ifndef _WIN32
#include <pthread.h>
#else
#include <windows.h>
#endif
enum rust_task_state {
task_state_newborn,
task_state_running,
task_state_blocked,
task_state_dead
};
typedef indexed_list<rust_task> rust_task_list;
struct rust_task_thread : public kernel_owned<rust_task_thread>,
rust_thread
{
private:
lock_and_signal lock;
// Fields known only by the runtime:
rust_log _log;
const int id;
#ifndef __WIN32__
static pthread_key_t task_key;
#else
static DWORD task_key;
#endif
static bool tls_initialized;
context c_context;
bool should_exit;
stk_seg *cached_c_stack;
stk_seg *extra_c_stack;
rust_task_list running_tasks;
rust_task_list blocked_tasks;
rust_task *dead_task;
void prepare_c_stack(rust_task *task);
void unprepare_c_stack();
rust_task_list *state_list(rust_task_state state);
const char *state_name(rust_task_state state);
public:
rust_kernel *kernel;
rust_scheduler *sched;
rust_srv *srv;
// NB: this is used to filter *runtime-originating* debug
// logging, on a per-scheduler basis. It's not likely what
// you want to expose to the user in terms of per-task
// or per-module logging control. By default all schedulers
// are set to debug-level logging here, and filtered by
// runtime category using the pseudo-modules ::rt::foo.
uint32_t log_lvl;
size_t min_stack_size;
rust_env *env;
randctx rctx;
int32_t list_index;
const char *const name;
// Only a pointer to 'name' is kept, so it must live as long as this
// domain.
rust_task_thread(rust_scheduler *sched, rust_srv *srv, int id);
void activate(rust_task *task);
void log(rust_task *task, uint32_t level, char const *fmt, ...);
rust_log & get_log();
void fail();
size_t number_of_live_tasks();
void reap_dead_tasks();
rust_task *schedule_task();
void start_main_loop();
void log_state();
void kill_all_tasks();
rust_task *create_task(rust_task *spawner, const char *name);
void transition(rust_task *task,
rust_task_state src, rust_task_state dst,
rust_cond *cond, const char* cond_name);
virtual void run();
void init_tls();
void place_task_in_tls(rust_task *task);
static rust_task *get_task();
// Called by each task when they are ready to be destroyed
void release_task(rust_task *task);
// Tells the scheduler to exit it's scheduling loop and thread
void exit();
// Called by tasks when they need a stack on which to run C code
stk_seg *borrow_c_stack();
void return_c_stack(stk_seg *stack);
};
inline rust_log &
rust_task_thread::get_log() {
return _log;
}
// This stuff is on the stack-switching fast path
#ifndef __WIN32__
inline rust_task *
rust_task_thread::get_task() {
if (!tls_initialized)
return NULL;
rust_task *task = reinterpret_cast<rust_task *>
(pthread_getspecific(task_key));
assert(task && "Couldn't get the task from TLS!");
return task;
}
#else
inline rust_task *
rust_task_thread::get_task() {
if (!tls_initialized)
return NULL;
rust_task *task = reinterpret_cast<rust_task *>(TlsGetValue(task_key));
assert(task && "Couldn't get the task from TLS!");
return task;
}
#endif
// NB: Runs on the Rust stack
inline stk_seg *
rust_task_thread::borrow_c_stack() {
I(this, cached_c_stack);
stk_seg *your_stack;
if (extra_c_stack) {
your_stack = extra_c_stack;
extra_c_stack = NULL;
} else {
your_stack = cached_c_stack;
cached_c_stack = NULL;
}
return your_stack;
}
// NB: Runs on the Rust stack
inline void
rust_task_thread::return_c_stack(stk_seg *stack) {
I(this, !extra_c_stack);
if (!cached_c_stack) {
cached_c_stack = stack;
} else {
extra_c_stack = stack;
}
}
//
// Local Variables:
// mode: C++
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End:
//
#endif /* RUST_TASK_THREAD_H */
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